When hockey players push the puck along the ice it slides causing heat which melts the ice causing the friction against the ice to be less.
Speed or power activities
In order to change the frictional force between two solid surfaces, it can be changed by shorter distances and by the amount of weight it has or the amount of force that is pushing that object to go however distance it can.
I believe you are right. pH is the concentration of H+. Therefore the more acidic the more H+.
